These rare crystals, of this quality, were found just ONCE in the mid 1980s and brought to market by John Whitmire in a single offering at the Tucson show. A choice example remains today one of the hardest items of Mexican material to obtain. This piece is "just a thumb size" perhaps, but what a fine one! Super crystals to 1.75 cm, top quality, in an elegant splayed cluster! This was a select specimen, formerly in the collection and with label of Willard Perkins, the collector who invented the so-called "Perky Box" for thumbnails. THIS IS BETTER In PERSON!